Add a new script to make it trivial and less error-prone to perform a mass version-bump

Dockerfile.template

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+# vim:set ft=dockerfile:
+FROM debian:wheezy
+
+# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
+RUN groupadd -r postgres && useradd -r -g postgres postgres
+
+RUN apt-get update && apt-get install -y curl
+
+RUN curl -o /usr/local/bin/gosu -SL 'https://github.com/tianon/gosu/releases/download/1.1/gosu' \
+	&& chmod +x /usr/local/bin/gosu
+
+ENV PG_MAJOR %%PG_MAJOR%%
+ENV PG_VERSION %%PG_VERSION%%
+
+RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ wheezy-pgdg main' $PG_MAJOR > /etc/apt/sources.list.d/pgdg.list \
+	&& curl -sSL https://www.postgresql.org/media/keys/ACCC4CF8.asc \
+		| apt-key add - ED6D65271AACF0FF15D123036FB2A1C265FFB764
+
+RUN apt-get update \
+	&& apt-get install -y postgresql-common \
+	&& sed -ri 's/#(create_main_cluster) .*$/\1 = false/' /etc/postgresql-common/createcluster.conf \
+	&& apt-get install -y \
+		postgresql-$PG_MAJOR=$PG_VERSION \
+		postgresql-contrib-$PG_MAJOR=$PG_VERSION
+
+ENV PATH /usr/lib/postgresql/$PG_MAJOR/bin:$PATH
+ENV PGDATA /var/lib/postgresql/data
+VOLUME /var/lib/postgresql/data
+
+ADD ./docker-entrypoint.sh /
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+EXPOSE 5432
+CMD ["postgres"]

update.sh

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+#!/bin/bash
+set -e
+
+cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
+
+versions=( "$@" )
+if [ ${#versions[@]} -eq 0 ]; then
+	versions=( */ )
+fi
+versions=( "${versions[@]%/}" )
+
+packagesUrl='http://apt.postgresql.org/pub/repos/apt/dists/wheezy-pgdg/main/binary-amd64/Packages'
+packages="$(echo "$packagesUrl" | sed -r 's/[^a-zA-Z.-]+/-/g')"
+curl -sSL "${packagesUrl}.bz2" | bunzip2 > "$packages"
+
+for version in "${versions[@]}"; do
+	fullVersion="$(grep -m1 -A10 "^Package: postgresql-$version\$" "$packages" | grep -m1 '^Version: ' | cut -d' ' -f2)"
+	(
+		set -x
+		cp Dockerfile.template "$version/Dockerfile"
+		sed -i 's/%%PG_MAJOR%%/'$version'/g; s/%%PG_VERSION%%/'$fullVersion'/g' "$version/Dockerfile"
+	)
+done
+
+rm "$packages"